Let us say I want to remove myself from the thread in this forum, how can I do that? It seems to be like a spam to me when I don;t want to watch a particular thread anymore and the email from that particular thread still being emailed to me again and again.

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You need to edit your posts and untick them, and make sure in the future if you don't want to watch them untick it, or what most sensible people do, untick it in your profile and only tick the ones you want to watch

And it aint spam, it's not commercial, it's not unsolicited, you just can't work out how to turn it off